Study on catalytic synthesis of n-octyl acetate in ionic liquid

The n-octyl acetate is one kind of achromatic color transparent liquid has the orange flower,the jasmine and the apple fragrance edible spice.A ionic liquid\[pmim\]PTSA was preparated by microwave radiation,and its structures was characterized by FT-IR.N-octyl acetate was synthesized from acetic acid and n-octanol with ionic liquid\[bmim\]PTSA as catalyst.The influences of the amount of ionic liquid,the reaction time,and the mole ratio between alcohol and acid on the esterification yield,and the catalyst properties of \[pmim\]PTSA were discussed.The optimized condition are follow:\[bmim\]PTSA 15mL,the mole ratio of alcohol to acid 1.5:1.0,the reaction time 2.5h,The esterification yield is 91.5%.The n-octyl acetate and the ionic liquid could be easily separated from the reaction system via simple phase separation.After used 6 times under the esterification the \[pmim\]PTAS keeps high catalyst.The ionic liquid is good catalyst of the esterification.